:func:`filterfalse` pred, seq elements of seq where pred(elem) is False
:func:`groupby` iterable[, keyfunc] sub-iterators grouped by value of keyfunc(v)
:func:`islice` seq, [start,] stop [, step] elements from seq[start:stop:step]
- :func:`starmap` func, seq func(\*seq[0]), fun(\*seq[1]), ...
+ :func:`starmap` func, seq func(\*seq[0]), func(\*seq[1]), ...
:func:`tee` it, n it1, it2 , ... itn splits one iterator into n
:func:`takewhile` pred, seq seq[0], seq[1], until pred fails
:func:`zip_longest` p, q, ... (p[0], q[0]), (p[1], q[1]), ...